Is the birthday of Hong Kong people mainly based on the lunar calendar or the Gregorian calendar? Ask god for help

Most of them are based on the Gregorian calendar. I'm born after 60, and I forgot my lunar birthday. But my old-fashioned birth paper has a lunar calendar, and the new (post-80 s) birth paper only has a solar calendar, so most people only remember the solar calendar. Hong Kong identity cards and social workers only mention the Gregorian calendar, and so does socializing with friends. But many careful mothers will still remember their children's lunar birthdays. Ask her and she'll tell you. Mother will also write on the child's birth paper to let him know that Hong Kong people use the Gregorian calendar for fortune telling and fortune telling. It doesn't matter if they forget.